Opening die-head for cutting threads on bolts or pipes.



No. 638,299. I Patented Dec. 5, IBM

W. L. TDBEY.

OPENING DIE HEAD FUR CUTTING THREADS UN BULTS UR PIPES.

7 (Application filed Mar. 22, 1899.) (N0 M B 2 Sheets-Sheet l.

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No. 638,299. Patented Dec. 5, I899.

. W. L. TDBEY. OPENING DIE HEAD FOR CUTTING THREADS 0N BOLTS DB PIPES.

(Application filed Mar. 22, 1899.) 7 (No Model.) 2 Sheets-Sheet 2.

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.with the other end slotted for the dies 6.

UTTED STATES twice.

W'ILL'IAM L. TOBEY, OF BOSTON, MASSACHUSETTS.

OPENING DIE-HEAD FOR CUTTtNG THREADS ON BOLTS 0R PIPES.

SPECIFICATION forming part of Letters Patent No. 638,299, dated December5, 1899.

Application filed March 22, 1899. $erial No. 710,114. No model.)

.10 all whom iv may concern.-

Be it known that I, VVILLIAM L. TOBEY, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Opening Die- Heads for Cutting Threads on Bolts orPipes, of which the following is a specification, in connection with theaccompanying drawings.

Like letters on the drawings represent like parts.

This invention has for its object the production of an opening andadjustable the head which will lock the dies solid when closed, admit ofeasy and universal adjustment when closed, open and close the dieseasily without any tendency to wear the dies, guides,oradjustmentwhennnlocked, hold the dies in place in any position of the head whendisconnected for changing dies, admit of changing the dies without theuse of a Wrench, free the interior of the head from oil withoutthrowing-oil around except in one plane, and one that is short andcompact,that will be simple, and that can be manufactured at areasonable cost. I obtain this by the construction shown in theaccompanying drawings, of which-- Figure 1 shows on the lower half anexternal side view and on the upper half a section of the die-head whenclosed, with the sliding hand-ring, the adjustable locking-ring, thedies, opening-lever, friction die-holder, oil grooved face-plate edge,and spring-block limiting movement of ring longitudinally on the head.Fig. 2 shows an external end view with the dies, adjusting and lockingcams, friction die-holders, and center chamber oildrains. Fig. 3 showsthe dies opened with the hand-ring b drawn back against the stop block mand the locking-ring 0 back ofi of the dies e, allowing the lever cl tomove the dies out. Fig. 4 shows the stop-block m pushed down and thering I) moved back, so that the lever 01 is disengaged from the die 6.

The construction is as follows: There is a central barrel at, having onthe back end a suitable flange for bolting to a machine and In line withthe-dies e is'milled a slot to receive the opening-lever d. One end ofthe lever 01 engages in a slot in the back of the die e. The top oflever d has two projecting dogs,

that by contact with the ring I) reciprocate the lever d and open andclose the die 6. Around the barrel a there is a sliding handring Z), towhich is secured the locking-ring c by two bolts t, clamping through theslots in the ring I). The locking-ring c has on its face the projectinglug k, engaging when closed a corresponding lug on the top of the die 6.The locking ring c has the two holes p in the outside for the insertionof a bar or spanner to turn the ring 0 when the nuts 25 are slackened.The locking-ring c carries internal cam-faces, by which the radialmovement of the cutters may be adjusted.

The faceplate f is fastened to the barrel 0. by screws and carries overeach die e the friction-stud g. The stud g is held in place against thedie 6 by the spring hand the screw t'through the spring h. Through thefaceplate f to the central chamber are the holes a, which allow theescape of oil to the face of the face-plate f. Around the edge of theface-plate f is a grooved oil-flange, which prevents the oil runningback on the head and being thrown around the whole length of the head,as follows; the waste oil after being applied to the cutting-dies flowsout of the center chamber through the holes at to the front of theface-plate. Centrifugal force carries the oil to the outer sharp edge ofthe groove, where the oil is thrown off in one plane instead of alongthe whole length of the rings 17 and c. If the machine is at rest, theoil runs out the center hole 72, and down the face of the plate,dropping off the lower edge. If for any reason the head is turnedaround, the groove prevents the oil running back on the rings by forminga channel, in which the oil will run to the lowest point and drop fromthere.

On the back part of the barrel a is the block m, which slides in a holein the barrel a and is kept in place by the spring .9 and the screw usliding in a slot in the flange of the barrel Ct.

ICC

the projecting dog w of the opening-lever d. Further movement of theringb until in con tact with the block m carries the lever (Z to theposition shown in Fig. 3, when the die 6 is opened clear of the threadout. If it is desired to change the dies 6, the block on is presseddown, so that the ring 12 will pass over the block m, carrying the lever01 to the extreme position, as shown in Fig. 4, when the lever d isdisengaged from the die 6 and the die 6 can be Withdrawn. I11 putting inthe die 6 it is held in place for the proper engagement of the lever 01by the friction-stud When all the dies are in place, the forward motionof the ring I) pushes down the lever d, engaging the slots in the dies eand forcing down the dies c to the closed position. Continued forwardmovement of the ring I) carries the locking-ring a over the top of thedie 6 until the locking-lug 79 is engaged. The first forward movement ofthe ring I) uncovers the block m, when the spring .9 forces up the blockm, stopping the return movement of the ring 1) beyond that necessary toopen the die e.

The lockingring 0 does not necessarily cover the whole of the die 6, butpreferably the greater part, as shown, on account of the more solidholding of the dies.

Iclaim as myinvention and desire to secure by Letters Patent 1. Thecombination in an opening die-head of the movable dies, independentopening and closing levers operating directly on the dies, anindependent locking-ring partially covering the dies when closed andlooking directly and positively by engaging a lug on the dies withcam-ribs on the locking-ring, said looking or die ring having adjustmentfor varying the locking position of the dies.

2. The combination in an opening die-head of the movable dies, openingand closing 1evers, an adj nstable die-ring having cam-ribs for varyingthe locking position of the dies and a spring friction device applied tothe dies at right angles to the direction of adj ustment of the dies, tohold the dies in any position substantially as described.

3. The combination in an opening die-head of the movable diesoperating-levers, adjustable die-ring having cam-ribs for varying thelocking position of the dies, and an actuatingring with spring-stoplimiting the movement of the actuating-ring when in position and whichby pressure toward the center axis of the die-head allows furthermovement to the actuating-ring.

4. The combination in an opening die-head of the movable dies,actuating-ring, operating-levers, adjustable die-ring having camribs forvarying the locking posit-ion of the dies, a drain hole or holes fromcenter chamber of head through face-plate and face-plate having anoil-groove in periphery substantially as described.

In testimony whereof I have afiixed my signature in presence of twoWitnesses.

\VILLIAM L. TOBEY.

Witnesses:

EDW. R. LEWIS, T. L. TIsDALE.

